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Simplifying 7x + -1(3x + 7) = 21 Reorder the terms: 7x + -1(7 + 3x) = 21 7x + (7 * -1 + 3x * -1) = 21 7x + (-7 + -3x) = 21 Reorder the terms: -7 + 7x + -3x = 21 Combine like terms: 7x + -3x = 4x -7 + 4x = 21 Solving -7 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 4x = 21 + 7 4x = 21 + 7 Combine like terms: 21 + 7 = 28 4x = 28 Divide each side by '4'. x = 7 Simplifying x = 7
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